btrfs: tree-checker: Check item size before reading file extent type
In check_extent_data_item(), we read file extent type without verifying if the item size is valid. Add such check to ensure the file extent type we read is correct. The check is not as accurate as we need to cover both inline and regular extents, so it only checks if the item size is larger or equal to inline header. So the existing size checks on inline/regular extents are still needed. Signed-off-by: NQu Wenruo <wqu@suse.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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